EP1087632B1 - Verfahren zur Verwaltung der Übertragung von einem Endgerät zu einer Basisstation - Google Patents

Verfahren zur Verwaltung der Übertragung von einem Endgerät zu einer Basisstation Download PDF

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Publication number
EP1087632B1
EP1087632B1 EP20000305853 EP00305853A EP1087632B1 EP 1087632 B1 EP1087632 B1 EP 1087632B1 EP 20000305853 EP20000305853 EP 20000305853 EP 00305853 A EP00305853 A EP 00305853A EP 1087632 B1 EP1087632 B1 EP 1087632B1
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EP
European Patent Office
Prior art keywords
bearer
radio
blind
terminal
base station
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP20000305853
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English (en)
French (fr)
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EP1087632A1 (de
Inventor
Christophe Guerard
Simon Baillarin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TRT Lucent Technologies SA
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TRT Lucent Technologies SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from EP99460059A external-priority patent/EP1087634A1/de
Application filed by TRT Lucent Technologies SA filed Critical TRT Lucent Technologies SA
Priority to EP20000305853 priority Critical patent/EP1087632B1/de
Publication of EP1087632A1 publication Critical patent/EP1087632A1/de
Application granted granted Critical
Publication of EP1087632B1 publication Critical patent/EP1087632B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/02—Buffering or recovering information during reselection ; Modification of the traffic flow during hand-off
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/06—Reselecting a communication resource in the serving access point

Definitions

  • This invention relates to a method for managing information transmission between a telecommunications terminal comprising a so-called “blind” radio and a base station of a telecommunications network, said method being used for switching bearers during this transmission. It is implemented in the field of wireless telecommunications network using a so-called "blind” radio. Such a network is known from documment EP 722 259.
  • DECT digital electrospray
  • communications are transported over carrier frequencies, each having a frame structure.
  • Three frequency bands are allocated to the DECT system. Each of these frequency bands is split into ten carrier frequencies. Each carrier is divided into 24 time intervals, twelve of which are used for transmission in the uplink direction (from terminal to base station) and the other twelve for transmission in the downlink direction (from base station to terminal).
  • the link between a terminal and its base station is performed, in the downlink direction, on a first bearer - time interval n and carrier frequency c - and, in the uplink direction, on another bearer depending on the first one - time interval n+12 and carrier frequency c -.
  • bearer the pair composed of at least one time interval within the radio frame and a carrier frequency, whereon a radio link is established, will be called bearer.
  • bearers each comprise a single time interval.
  • bearers can comprise several consecutive time intervals.
  • the bearer composed of time interval n and carrier frequency c is marked as [n;c] and the bearer composed of time intervals n and n+1 and carrier frequency c is marked as [(n,n+1);c].
  • the terminal When interference comes up disrupting the radio link between the terminal and the base station, it is sometimes required to switch bearers. The terminal then starts to search for a new bearer whereon the radio link will not be disrupted. When a new bearer has been found, the communication between the terminal and the base station is transferred onto this new bearer by reprogramming the radio of the terminal and the base station on this new bearer.
  • the terminal radio must process simultaneously the bearer signals of the disrupted link and those of the new potential bearer. Due to this dual processing, it appears that using a so-called "blind" radio in the terminals significantly limits the number of new potential bearers. Indeed, so-called “blind” radios specify the radios that cannot process the signals contained in two consecutive time intervals. As a result, such a radio, also called blind radio, cannot search for a new bearer comprising a time interval adjacent to that of the bearer already used. This impossibility is illustrated on a DECT frame represented in Fig. 1.
  • the bearers [6;c] and [18;c] are allocated to transmitting information between the terminal and the base station, respectively in the downlink and uplink directions. If, for any reason, bearer [6;c] (or bearer [18;c]) must be switched, the terminal's "blind" radio is not capable of processing simultaneously bearer [6;c] and bearer [5;c] or [7;c] (respectively [17;c] or [19;c]).
  • a "blind" radio significantly limits the bearer switching capacities. This may result in blocking situations when the remaining bearers are already being used for other calls.
  • Fig. 1 that exchanges between the terminal and the base station are performed in each direction for a single time interval.
  • This data exchange protocol is commonly called LU1. In particular, it is used for transporting voice (telephone call).
  • Fig. 2 illustrates a second data exchange protocol commonly called LU7, wherein exchanges are performed in each direction for two consecutive time intervals.
  • This bearer then comprises two adjacent time intervals and a carrier frequency. For clarity's sake, this is then called a dual bearer to distinguish them from single bearers comprising a single time interval.
  • Fig. 2 represents a DECT frame of carrier frequency c.
  • a terminal and a base station communicate over the dual bearer [(6,7);c] in the downlink direction and the dual bearer [(18,19);c] in the uplink direction.
  • the number of the first of two consecutive time intervals must be even.
  • the new dual bearers comprising the single bearers [5;c or c'] and [8;c or c'] are prohibited.
  • the choice of new dual bearers is even more restricted.
  • Blocking situations can occur when other terminals are communicating.
  • a blocking example on a carrier frequency c is illustrated by Fig. 3.
  • the dual bearer [(6,7);c] is used for transporting data and the single bearers [0;c], [3;c] and [11;c] (hatched in the frame of Fig. 3) are used for transporting telephone calls. If for any reason, it is required to switch dual bearers, there is no other possibility on this carrier because of the constraints imposed by the blind radio and the LU7 protocol.
  • the object of the invention is a method for managing information transmission via successive radio frames between a telecommunications terminal comprising a so-called "blind" radio and a base station of a telecommunications network, each radio frame comprising a plurality of bearers, each defined by at least one time interval within the radio frame and a carrier frequency, said information transmission being performed on the first bearer, said method being used for bearer switching during said transmission and comprising a step of searching for a new bearer available and a step of programming the so-called "blind” radio on said new bearer, characterized in that said search step is taking place on a limited number of radio frames, and in that, during this step, the programming of the so-called "blind” radio on said first bearer is interrupted.
  • the new bearers can be defined for time intervals adjacent to that (or those, in case of a first dual bearer) of the first bearer.
  • the information contained in the radio frames not received by the terminal during the search step are saved in a buffer memory of the base station during this step, then retransmitted to the terminal after the link has been established on the new bearer.
  • the bearer whereon the link is established before bearer switching is called the first bearer.
  • programming the "blind" radio of the terminal on the first bearer is interrupted during the search for a new bearer.
  • the constraints imposed by the "blind" radio of the terminal no longer apply to bearer switching.
  • the new bearers [5;c] and [8;c] are no longer prohibited. This new situation is illustrated by Fig. 4.
  • interrupting programming of the "blind" radio on the first bearer during the search makes it possible to raise the numbers of new potential bearers from 3x10 to 5x10, corresponding to an increase of 67%.
  • the buffer memory used for saving the data not received generally already exists in the base stations. It is usually used for saving the data when requesting repetition (ARQ) for error correction.
  • a sample buffer memory is shown in Fig. 6. It comprises eight registers each capable of storing the data contained in time interval of a DECT frame. With this buffer memory, programming the "blind" radio can be interrupted during a maximum of eight radio frames without information loss.
  • a time interval comprises:
  • the data is contained in field B.
  • This field is composed of:
  • field B can contain 720 or 800 data bits. Also, for retransmitting the data saved in the buffer memory, current field B is raised from 720 to 800 bits for evacuating one eighth (1/8) of the data of a saved frame (i.e. 80 bits) to each current frame.
  • the "blind" radio is reprogrammed on the first bearer after the search step and the data not received by the terminal during the search step is then retransmitted together with the current frames as done previously.

Claims (3)

  1. Verfahren zur Verwaltung von Informationsübertragung über aufeinanderfolgende Funkrahmen zwischen einem Telekommunikationsendgerät mit einem sogenannten "blinden" Funkgerät und einer Basisstation eines Telekommunikationsnetzes, wobei jeder Funkrahmen eine Mehrzahl von Trägern umfaßt, die jeweils durch mindestens ein Zeitintervall in dem Funkrahmen und eine Trägerfrequenz definiert sind, wobei die Informationsübertragung über einen ersten Träger durchgeführt wird, wobei das Verfahren zum Umschalten von Trägern während der Übertragung benutzt wird und einen Schritt des Suchens nach einem neuen verfügbaren Träger und einen Schritt des Programmierens des sogenannten "blinden" Funkgeräts auf dem neuen Träger umfaßt, dadurch gekennzeichnet, daß der Suchschritt eine begrenzte Anzahl von Funkrahmen lang stattfindet, und daß während dieses Schritts das Programmieren des sogenannten "blinden" Funkgeräts auf dem ersten Träger unterbrochen wird.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß während des Suchschritts die vom Endgerät nicht empfangenen Informationen in einem Pufferspeicher der Basisstation gesichert werden und danach während der Informationsübertragung auf dem neuen Träger übertragen werden.
  3. Verfahren nach Anspruch 2, dadurch gekennzeichnet, daß wenn der Pufferspeicher m Pufferregister umfaßt, die jeweils zum Sichern eines Funkrahmens in der Lage sind, der Suchschritt für maximal m Funkrahmen ohne Informationsverlust stattfindet.
EP20000305853 1999-09-27 2000-07-11 Verfahren zur Verwaltung der Übertragung von einem Endgerät zu einer Basisstation Expired - Lifetime EP1087632B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP20000305853 EP1087632B1 (de) 1999-09-27 2000-07-11 Verfahren zur Verwaltung der Übertragung von einem Endgerät zu einer Basisstation

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP99460059 1999-09-27
EP99460059A EP1087634A1 (de) 1999-09-27 1999-09-27 Verfahren zur Steuerung der Übertragung zwischen einem Endgerät und einer Basisstation
EP20000305853 EP1087632B1 (de) 1999-09-27 2000-07-11 Verfahren zur Verwaltung der Übertragung von einem Endgerät zu einer Basisstation

Publications (2)

Publication Number Publication Date
EP1087632A1 EP1087632A1 (de) 2001-03-28
EP1087632B1 true EP1087632B1 (de) 2005-06-15

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EP20000305853 Expired - Lifetime EP1087632B1 (de) 1999-09-27 2000-07-11 Verfahren zur Verwaltung der Übertragung von einem Endgerät zu einer Basisstation

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Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2297013B (en) * 1995-01-10 1999-09-15 Nokia Mobile Phones Ltd Portable radio telephones and methods of operation
DE19640450C1 (de) * 1996-09-30 1997-10-30 Siemens Ag Basisstation mit schneller Kanalwechselfunktion eines zellularen TDMA/FDMA-Funksystems, insbesondere eines zellularen DECT-Systems
IT1298795B1 (it) * 1998-03-26 2000-02-02 Italtel Spa Metodo per effettuare una pre-selezione veloce e completa dei canali in un sistema di telecomunicazione digitale

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EP1087632A1 (de) 2001-03-28

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